JPS5835140B2 - Press backlash - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises two mold parts arranged coaxially overlapping each other and a guide member connected to the upper part of the press mold which can be raised and lowered for forming the sidewall of a tire. a retained radially movable circumferential portion for forming a tire tread;
It relates to a press mold for tire vulcanization, comprising an actuating device arranged between said upper mold part and an upper part of the press mold for producing a radial expanding force acting on said circumferential surface part. be.

Press dies of this type are well known and often have two
It is called Ai Press.

These types of press molds are used with particular advantage in the production of radial-ply tires, because in the case of these tires it is very special that the belt does not hold back against the rest of the tire during closure of the mold. Do not change its position.

This requirement can be met using the two-phase type described above.

That is, in the case of these press molds, the side walls are already brought to their final position before the action of any mold part on the circumferential surface of the tire, thereby controlling the axial movement of the belt. The possibility of this occurring is virtually eliminated.

In the case of known two-phase molds, the upper part of the press mold, which can be raised and lowered, is arranged between the upper mold part and the peripheral part is enlarged before and during the closing procedure of the mold, and the press The actuating device for extracting these parts from the forming profile of the tire after opening consists of a hydraulically or pneumatically actuated cylinder-piston arrangement which must be controlled according to the operating cycle of the press.

The control of the working cycle in the case of two-phase presses having hydraulic or pneumatic actuators, although making satisfactory operation of the two-phase type practically practicable, entails certain drawbacks. We are prepared.

That is, especially caused by high temperatures in the press,
The seals of this cylinder-piston arrangement become severely worn and torn, and furthermore, during the use of hydraulic power, water leaks out of the cylinder-piston arrangement and reaches the upper surface of the tire, thereby causing cooling and thus the tire. There are some things that have a negative impact on the quality of the product.

In order to eliminate this drawback in the case of known two-phase pressing, the cylinder must be relieved of pressure during the pressing process and then be given a new pressure supply.

This method of operation is obviously somewhat complex and time consuming and has a negative impact on the economy of the press.

The object of the present invention is to design a press mold of the type mentioned above which does not have the above-mentioned disadvantages, and which can be manufactured economically and which has almost no problems in practical use. It is an object of the present invention to provide a press mold in which at least a large part of the abrasive forces that occur inside the press mold and cause wear and tear are eliminated.

According to the invention, this problem is solved by the actuating device comprising at least one compression spring arranged coaxially in the center of the press and mold and in the upper part of the press mold. The solution is that a receptacle, which is provided and is at least partially cylindrical, is guided into the receiving space.

The use of one or more compression springs coaxial with the center of the press and mold allows for the required expansion of the curved portion before and during closure, and for the formation of the tire upon opening of the press. Removal of the circumferential part from the profile is ensured, and at the same time the problem-prone seals and leakage of compressed air or power water, which are necessary in the case of known presses with a cylinder-piston arrangement, are avoided. The need for special controls for pressure supply or pressure relief during the vulcanization process is eliminated.

Furthermore, the invention reduces manufacturing costs and requires less maintenance, thereby reducing the cost of the press mold.

Yet another advantage to be noted of the press molds designed in accordance with the present invention is that the compression springs generally have some degree of lateral elasticity, so that the various cooperating parts can be easily deflected. A correction is obtained for this, thereby avoiding undesirably high frictional forces within the mold part.

In one particularly advantageous embodiment of the invention, the compression spring is supported on the upper mold part via a replaceable ring element.

Preferably, the ring element is designed as a support flange and the receiver in the upper mold part is inserted into the part with radial clearance.

This radial play allows for a correction that is advantageous in terms of reducing wear and tear, but if the lateral stiffness of the compression springs is significantly large, the spring-spring ring alone cannot provide this correction. It is not possible to guarantee early delivery.

Advantageously, said ring element consists of a plurality of element parts, said element parts arranged with their ends axially superimposed on one another, advantageously on a sleeve corresponding to an extension of said support flange. It is designed to be able to slide.

According to this embodiment, it is possible to always use the same compression spring in the press mold when work has to be carried out with molds of different heights.

A further embodiment of the invention differs significantly from the embodiments described above, in that the receiving space towards the support end has a cylindrical area, in which the receiving space has a cylindrical area on the side of the upper mold part. , conical enlarged areas are combined.

Advantageously, the compression springs are arranged fairly loosely within the receiving space.

In this way, the press can be adjusted without applying pressure in the opposite direction after the spring is removed, so that the height of the mold can be adjusted without difficulty.

Yet another significant advantage of the press mold according to the invention, compared to known press molds having hydraulic or pneumatic actuators, is that this use of compression springs changes the height of the mold. It's because there's no longer a need for it.

For this reason, a simple changeover of known press molds is also possible.

The present invention will now be described in detail with reference to the accompanying drawings.

The tire vulcanizing press mold shown in FIG. 1 consists of a lower press part 1 which cooperates with each other to form a heating press, an upper press part 2 which can be raised and lowered, and a lower mold half that rests on the hem. It consists of a body (part) 3, an upper mold half 4, and a two-phase mold formed by a plurality of circumferential parts connected to a guide member 6.

The peripheral part 5 is held on the guide member 6 by means of a guide bolt T and has an inclined surface on its outer side.

The guide pole l-7 passes through the guide member 6, and the head of the bolt 7 is hooked on the guide member.

Further, a nut attached to the tip of the bolt can slide through a hole provided in the circumferential surface portion 5.

The circumferential part 5 therefore hangs from the guide element 6.

Said beveled surface cooperates with a corresponding beveled surface of the guide member 6 such that said circumferential surface portion is moved radially inwardly as the mold is closed.

A receiving space 8 for a compression spring 9 is provided in the upper part of the press, concentric with the center of the press and the mold.

The compression spring 9 is on the one hand an end wall or receiving space 8
They are each supported on a ring element 10 which is inserted with clearance into a recess 11 provided in the half-scraper 4 on a suitable shoulder on the inside and on the other side.

The ring element 10 has sleeve-shaped adjacent pieces radially inwardly.

The sleeve-shaped adjoining piece extends in the direction of the receiving space 8 and is used both for the guidance of the compression spring 9 and as a support and guide for the smooth ring placed thereon if required. Using the compression springs 9, it is possible to make height corrections in case of different molds so as to be able to work at all times.

The adjustable holder 12 allows the height of the mold to be adjusted.

In this connection, it is essential that the height adjustment of this type is carried out after the removal of the spring 9, which is only loosely positioned in the receiving space 8.

Adjustment of the height of the mold is therefore very simple.

The receiving space 8' provided in the end region 13 supporting the spring 9 has a substantially cylindrical shape.

A conically shaped enlarged area 14 is connected to the cylindrical area 13 in the direction of the upper mold part 4 .

The compression spring 9 thus corrects possible misalignments between the mold center and the press center, thereby reducing the phenomena of wear and tear.

If the lateral stiffness of the compression spring 9 is too great to guarantee this correction alone, this required compensation ``1iii
: Definitely obtained.

It is also possible to use several compression springs instead of spring 9 for a single compression, if necessary to obtain the desired compression force, for example within a column size of 15 tons.

FIG. 1 shows a press mold in one phase of its operation, which occurs when the mold begins to close and just before it opens.

When the mold is closed, the tire is attached to the lower mold half 5 and the upper mold half 4 [11], and in this connection the spring 9 is pressed against one side and the required C) fixed. It transmits the force to the tire and also ensures the spreading effect of the circumferential surface part 5 under the external force '.

In a further step 5 of the closing procedure, the circumferential surface section 5 is moved radially inwardly and retracted by the cooperating inclined surfaces on it and on the guide member 6.

In this connection, the spring 9 is compressed. The final closed position is illustrated in FIG.

During the opening of the mold, the positions of the mold parts 3 and 4 are initially maintained by the compression and the spring force of the -f spring 7).
The guide member 6 is raised, and as a result of its rise the circumferential part 5 is guided radially outwards by the guide bolt 7 and the mutually inclined surfaces, so that the operating position shown in FIG. 1 is again obtained. It will be done.

When the mold is opened further, a condition is reached in which the compression springs 9 are substantially relaxed and the upper mold half 4 together with the peripheral part 5 is lifted from the lower mold half 3.

In the case of the press mold according to the invention, only pressure relief is provided during heating without sol problems, compressed air or power water leakage and control.

Furthermore, compared to previously known adjustment cylinders, the equipment costs are low, it operates virtually without maintenance and the mold is easily reconfigured.

[Brief explanation of the drawing]

1 is a schematic cross-sectional view of the press die in a partially open state, and FIG. 2 is a similar cross-sectional view of the press mold according to FIG. 1 in the closed state. 2... Upper part of the press die, 4... Upper die part, 8...
・The receiver is a receiving space, 9... Compression spring, 10... Ring element, 11... The receiver is a part, 12... Cylindrical area, 1
4... Cone-shaped expansion area.

Claims (1)

[Claims] 1. A fixed mold half 3, a movable mold half 4 which is on the same axis as the fixed mold half and can move toward and away from it, and is connected to an upper part 2 of the press mold which can be raised and lowered. a plurality of circumferential surface portions 5 held on the inclined surface of the guide member 6 and movable in the radial direction, and an actuating mechanism for applying a radial expansion action to the circumferential surface portions. The peripheral surface portion 5
a guide bolt 7 and a compression spring 9, which is located between the upper part 2 of the press mold and the movable mold half 4 and extends radially into the peripheral part 5; The cylindrical tube in which the compression spring is formed in the upper part of the press mold is loosely disposed in the radial direction within the receiving space 8, and furthermore, the lower end of the compression spring is connected to the movable mold. A press mold that is engaged with a ring element 10 that is placed in a cavity 11 provided in a semicircular space so as to be movable in the circumferential direction.